Jeremy Martin (6) competes in the first heat of the 450SX during the Monster Energy Supercross held at NRG Stadium in Houston, TX, Jan. 13, 2018. (Michael Wyke / For the Chronicle)

Jeremy Martin (6) competes in the first heat of the 450SX during the Monster Energy Supercross held at NRG Stadium in Houston, TX, Jan. 13, 2018. (Michael Wyke / For the Chronicle)

Photo: Michael Wyke/For The Chronicle

Jeremy Martin (6) competes in the first heat of the 450SX during...photo-14882702.177462 - |ucfirst

Adam Cianciarulo gets a sign message as he ride in the second heat of the 250SX during the Monster Energy Supercross held at NRG Stadium in Houston, TX, Jan. 13, 2018. (Michael Wyke / For the Chronicle)

Adam Cianciarulo gets a sign message as he ride in the second heat of the 250SX during the Monster Energy Supercross held at NRG Stadium in Houston, TX, Jan. 13, 2018. (Michael Wyke / For the Chronicle)

Photo: Michael Wyke/For The Chronicle

Adam Cianciarulo gets a sign message as he ride in the second heat...photo-14882701.177462 - |ucfirst

Shane Mcelrath (28) and Mitchell Oldenburg (52) compete in the first heat of the 250SX come during the Monster Energy Supercross held at NRG Stadium in Houston, TX, Jan. 13, 2018. (Michael Wyke / For the Chronicle)

Shane Mcelrath (28) and Mitchell Oldenburg (52) compete in the first heat of the 250SX come during the Monster Energy Supercross held at NRG Stadium in Houston, TX, Jan. 13, 2018. (Michael Wyke / For the

Dakota Alix (42) and Kyle Chisholm (11) compete in the first heat of the 250SX during the Monster Energy Supercross held at NRG Stadium in Houston, TX, Jan. 13, 2018. (Michael Wyke / For the Chronicle)

Dakota Alix (42) and Kyle Chisholm (11) compete in the first heat of the 250SX during the Monster Energy Supercross held at NRG Stadium in Houston, TX, Jan. 13, 2018. (Michael Wyke / For the Chronicle)

A track crew member pulls up a barrier as riders pass at the the start of the first heat of the 250SX during the Monster Energy Supercross held at NRG Stadium in Houston, TX, Jan. 13, 2018. (Michael Wyke / For the Chronicle)

A track crew member pulls up a barrier as riders pass at the the start of the first heat of the 250SX during the Monster Energy Supercross held at NRG Stadium in Houston, TX, Jan. 13, 2018. (Michael Wyke / For

A track crew member pulls up a barrier as riders pass at the the...photo-14882698.177462 - |ucfirst

A Monster Energy girl walks the heat marker in front of the riders before the start of the first heat of the 250SX during the Monster Energy Supercross held at NRG Stadium in Houston, TX, Jan. 13, 2018. (Michael Wyke / For the Chronicle)

A Monster Energy girl walks the heat marker in front of the riders before the start of the first heat of the 250SX during the Monster Energy Supercross held at NRG Stadium in Houston, TX, Jan. 13, 2018.

Cole Seely, left, and Ken Roczen compete in the first heat of the 450SX. The NRG course was set up as a technical track, giving riders obstacles to overcome.

Cole Seely, left, and Ken Roczen compete in the first heat of the 450SX. The NRG course was set up as a technical track, giving riders obstacles to overcome.

Photo: Michael Wyke, Freelance

Cole Seely, left, and Ken Roczen compete in the first heat of the...photo-14882684.177462 - |ucfirst

Jeremy Martin (6), Matthew Bisceglia (58) and Kyle Cunningham (39) are airborne in the first heat of the 450SX during the Monster Energy Supercross held at NRG Stadium in Houston, TX, Jan. 13, 2018. (Michael Wyke / For the Chronicle) less

Jeremy Martin (6), Matthew Bisceglia (58) and Kyle Cunningham (39) are airborne in the first heat of the 450SX during the Monster Energy Supercross held at NRG Stadium in Houston, TX, Jan. 13, 2018. (Michael ... more